Is this a display or a tool?

Well, everyone has a different idea of what is convenient or intuitive. MU4 is certainly different.

"Intuition" is in the eye of the beholder indeed, and any change will initially feel non-intuitive if you're already used to something else. But usability testing shows MU4 really is easier for new users to figure out without consulting documentation, which is the true measure of what constitutes an intuitive interface. The changes do indeed mean existing users have a slight adjustment period. Despite how different it looks, though, relatively little of substance has actually changed about the interface.